1.0 INTRODUCTION
© Presby Environmental, Inc., Design & Installation Manual, July 2020 Edition
3
1.1 Background
The EnviroFin
®
(EF) system creates an eco-system designed to simultaneously and passively purify and disperse
effluent after primary treatment by a septic tank. At the heart of the EF system is the centrally located Fin
Distribution Unit (FDU), a plastic basin & sump, which is perforated around the circumference including patented,
interior skimmer tabs. The FDU equalizes flow to other EF units in series and distributes effluent to 8 treatment
fins radiating outward from the central unit. The treatment fins provide superior wastewater treatment utilizing
high performance components. The perforated plastic air ducts supply oxygen to the bacterial surfaces and
remove waste gases. The green, randomized, plastic fibers packed beneath the air duct and the geotextile fabric
surrounding the treatment fin and FDU provide abundant and varied surface areas for bacterial attachment. The
treatment fins distribute the treated effluent to a bed of specified system sand for additional polishing and even
dispersal to the native soil interface. Treatment provided by the EF system protects the native soils from organic
clogging and the formation of less permeable biomats in these critical areas essential for consistent, long term
dispersal and infiltration of the treated wastewater flows. The EF system is also completely passive, requiring no
electricity, motors, alarms, computers, etc.
The system has been successfully tested and certified to NSF/ANSI 40, Class I (a certification typically given to
mechanical aeration devices) standards.
Additional system benefits include:
•
adapts well to difficult sites
•
installs easily and quickly
•
requires a smaller area
•
increases system performance and longevity
•
recharges groundwater more safely than traditional systems
Environmental Standards and Technical Support
All EF systems shall be designed and installed in compliance with the procedures and specifications detailed in this
Manual and in the product’s New Hampshire approval. In the event of contradictions between this Manual and
state rules, Presby Environmental, Inc. (PEI) should be contacted for technical assistance at (800) 473-5298.
Certification Requirements
Designers and installers who have not previously attended a PEI certification course are required to obtain
certification. Certification is obtained by attending a certification course presented by PEI or its sanctioned
representative or by viewing tutorial videos on our website and then successfully passing a short assessment test.
PEI recommends professionals involved in the inspection or review of EF systems also become PEI certified. This is
a separate, additional certification from the PEI pipe-based product lines.